Ah, but the denied message is a send, not a receive, so that's not it
(tested locally with a hacked snapd).
I took a look at the generated profile and it expanded to this:
692 dbus (send)
693 bus=system
694 path=/
695 interface=org.freedesktop.DBus.Peer
696 member=Ping
697
** Summary changed:
- avahi-control dbus permissions for Ping method need updating
+ avahi dbus permissions for Ping method need updating
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https://bugs.launchpad.net/bugs/1879231
Title:
